The Dravidians are struggling against powerful siege options such as Mangonels and Hussite Wagons.
Even if they obtain Bombard Cannons in the Imperial Age, they lack Siege Engineers, making their own siege units vulnerable to being destroyed.
To help them in this regard, one idea could be to grant them a technology that gives bonus damage to Elephant Archers against siege units.
This could allow them to deal more damage to Mangonels and Bombard Cannons, even without Siege Engineers.
Additionally, the Medical Corps upgrade could be changed to a civilization bonus instead of a unique technology, which would provide a 20 HP per minute regeneration rate to Elephant units.